Fuel Pressure: Testing and Inspection
Checking fuel pressure1. Remove the hot air guide on the left hand side to the rear of the engine compartment.
2. Unscrew and remove the cap nut from the test connection of the fuel distribution line.
Note: Make sure that the sealing ball does not fall out when the cap nut is removed.
3. Connect the dial gauge to the test connection with the hose from the pressure tester P378 or VW 1318
4. Disconnect the DEE relay from the central electric system, and bridge terminals 30 and 87b with a piece of cable. The fuel pump must now run.
5. Checking specification:
Engine stationary 3.8 ±0.2 bar
Engine idling approx 3.3 ±0.2 bar
6. Turning torque for the cap nut: 12 Nm (9 ft lbs)